Equations of the heart
Equations of the Heart
Kim Ha-rin (김하린), 16 years old from Seoul, studies at Daehan High School (대한고등학교).
On the outside, she seems like a perfect, quiet student , beautiful, polite, and always on time.
But behind her calm eyes hides a painful story: her father left when she was young, and her older brother died in a tragic accident four years ago. Since then, Ha-rin has lived alone with her mother, trying to hold her world together.
In middle school, Ha-rin had no friends at all ,even though she was beautiful, no one ever got close to her.
Her shyness built a wall between her and everyone else. Boys admired her from afar but never dared to talk to her, and girls whispered but never really knew her.
The only thing that made her feel alive was science.
She loved solving problems, experimenting, and searching for truths that people couldn’t lie about. Science was her escape her safe place.
Everything begins to change when she
meets Park Seo-yeon (박서연), the most popular girl at high school. Seo-yeon is confident, social, and full of life. She’s the first person who truly cares for Ha-rin, and slowly, she starts to melt the ice around her heart.
One morning on a crowded train to school, something terrible happens.A stranger touches Ha-rin’s skirt. She freezes, too scared to move. But suddenly, Lee Joon-ho (이준호), a boy from her school, grabs the man’s wrist and punches him.
The train falls silent. Ha-rin, trembling, thanks him softly and hands him a small sweet snack before leaving.
That one moment connects their fates and what starts as a simple act of bravery turns into a love triangle filled with emotion, secrets, and heartbreak